<template>
  <div class="chat_box">
    <header>在线人数{{ count }}</header>
    <div ref="msg_box" class="msg_box">
      <div
        v-for="(item,index) in list"
        :key="index"
        class="msg"
        :style="item.userId === userId? 'flex-direction:row-reverse' : ''"
      >
        <div v-if="userId" class="user-head">
          <div class="head"></div>
        </div>
        <div v-if="userId" class="user_msg">
          <span :style="item.userId === userId ? 'float: right;' : ''" :class="item.userId === userId ? 'right' : 'left'">
            {{ item.content }}
          </span>
        </div>
      </div>
    </div>
    <div class="input_box">
      <input ref="sendMsg" v-model="contentText" type="text" @keyup.enter="sendText()">
      <div class="btn" @click="sendText()">发送</div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Chat',
  data() {
    return {
      ws: null,

      count: 0,

      // 当前用户ID
      userId: 0,

      // 聊天记录的数组
      list: [],

      // input输入的值
      contentText: ''
    }
  }
}
</script>

<style scoped>
  .chat_box {
    margin: 0 auto;
    background: #fafafa;
    /*position: absolute;*/
    height: 100%;
    width: 100%;
  }

  .chat_box header{
    /*position: fixed;*/
    width: 100%;
    height: 3rem;
    background: #409eff;
    /*max-width: 700px;*/
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    color: white;
    font-size: 1rem;
    z-index: 999;
  }

  .chat_box .msg_box{
    position: absolute;
    height: 100%;
    width: 100%;
    overflow-y: scroll;
    box-sizing: border-box;
    padding: 3rem 0;
  }
  .chat_box .msg_box .msg{
    width: 95%;
    min-height: 2.5rem;
    margin: 1rem 0.5rem;
    position: relative;
    display: flex;
    justify-content: flex-start !important;
  }
  .chat_box .msg_box .msg .user-head{
    min-width: 2.5rem;
    width: 20%;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: #f1f1f1;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .chat_box .msg_box .msg .user-head .head{
    width: 1.2rem;
    height: 1.2rem;
  }

  .chat_box .msg_box .msg .user_msg{
    width: 80%;
    word-break: break-all;
    position: relative;
    z-index: 5;
  }
  .chat_box .msg_box .msg .user_msg span{
    display: inline-block;
    padding: 0.5rem 0.7rem;
    border-radius: 0.5rem;
    margin-top: 0.2rem;
    font-size: 0.88rem;
  }
  .chat_box .msg_box .msg .user_msg .left{
    background: white;
    animation: toLeft 0.5s ease both 1;
  }
  .chat_box .msg_box .msg .user_msg .right{
    background: #53a8ff;
    color: white;
    animation: toright 0.5s ease both 1;
  }
  @keyframes toLeft {
    0% {
      opacity: 0;
      transform: translateX(-10px);
    }
    100% {
      opacity: 1;
      transform: translateX(0px);
    }
  }
  @keyframes toright {
    0% {
      opacity: 0;
      transform: translateX(10px);
    }
    100% {
      opacity: 1;
      transform: translateX(0px);
    }
  }

  .chat_box .input_box{
    padding: 0 0.5rem;
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 2.5rem;
    background: #fafafa;
    box-shadow: 0 0 5px #ccc;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 999;
  }

  .chat_box .input_box input{
    height: 1.5rem;
    display: inline-block;
    width: 100%;
    border: none;
    border-radius: 0.2rem;
    font-size: 0.88rem;
  }
  .chat_box .input_box .btn{
    height: 1.5rem;
    min-width: 4rem;
    background: #e0e0e0;
    font-size: 0.88rem;
    color: white;
    text-align: center;
    border-radius: 0.2rem;
    margin-left: 0.5rem;
    transition: 0.5s;
  }
  .chat_box .input_box input .btn_active{
    background: #409eff;
  }
</style>
